Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 | 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 327x 327x 327x 327x 327x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 315x 315x 315x 315x 315x 315x 315x 315x 353x 353x 353x 353x 353x 353x 329x 329x 329x 329x 10x 10x 329x 353x 315x 315x 315x 313x 313x 313x 283x 283x 313x 315x 315x 315x 315x 315x | import { STATE_SYMBOL } from '../../../constants.js';
import { effect, render_effect } from '../../../reactivity/effects.js';
import { untrack } from '../../../runtime.js';
import { queue_micro_task } from '../../task.js';
/**
* @param {any} bound_value
* @param {Element} element_or_component
* @returns {boolean}
*/
function is_bound_this(bound_value, element_or_component) {
return (
bound_value === element_or_component || bound_value?.[STATE_SYMBOL] === element_or_component
);
}
/**
* @param {any} element_or_component
* @param {(value: unknown, ...parts: unknown[]) => void} update
* @param {(...parts: unknown[]) => unknown} get_value
* @param {() => unknown[]} [get_parts] Set if the this binding is used inside an each block,
* returns all the parts of the each block context that are used in the expression
* @returns {void}
*/
export function bind_this(element_or_component = {}, update, get_value, get_parts) {
effect(() => {
/** @type {unknown[]} */
var old_parts;
/** @type {unknown[]} */
var parts;
render_effect(() => {
old_parts = parts;
// We only track changes to the parts, not the value itself to avoid unnecessary reruns.
parts = get_parts?.() || [];
untrack(() => {
if (element_or_component !== get_value(...parts)) {
update(element_or_component, ...parts);
// If this is an effect rerun (cause: each block context changes), then nullfiy the binding at
// the previous position if it isn't already taken over by a different effect.
if (old_parts && is_bound_this(get_value(...old_parts), element_or_component)) {
update(null, ...old_parts);
}
}
});
});
return () => {
// We cannot use effects in the teardown phase, we we use a microtask instead.
queue_micro_task(() => {
if (parts && is_bound_this(get_value(...parts), element_or_component)) {
update(null, ...parts);
}
});
};
});
return element_or_component;
}
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